Independent tests prove lack of frequency hopping with XPS

[DesertHucker]

XJet now has my TX RX module's for testing interesting to see the outcome.

I lost my comp-arf Yak.
This is what I know
The RX had 6volts all the way to the ground
Data logger recording from spare RX port (eagle tree)
23 sec from lockout to impact (engine to idle, Engine stopped on impact, logged RPM)
All servos to fail-safe (engine back to idle, slight right aileron, slight up elevator)
Plane less than 70 feet from me holding radio above my head to try and get signal back.
JR/Graupner MX22 11v fresh charged battery first flight of the day, new field.
Previously had 30-40 flights at another field, all worked perfect.
Spectrum had flown twice before me and again after me 2 different DX7 radios.

Just my experience.

Loza

PS XJet did you get the XPS i sent?

[BoneDoc]

Interesting discussion.

XJet, when will those data become available?

[Kiwi]

Laurie.

That truly bloody sucks mate. Sorry to hear the YAK is Ex.

What I am sure of is Xjet is certainly capable of getting to the bottom of this. Now I´m all ears mate.

Have a coldy for me while your waiting on the answers, in fact you can have a few if you like digger.

[jonkoppisch]

Hey Loza, sorry about the yak...

[DesertHucker]

	Quote: Originally Posted by Kiwi
	Laurie. That truly bloody sucks mate. Sorry to hear the YAK is Ex. What I am sure of is Xjet is certainly capable of getting to the bottom of this. Now I´m all ears mate. Have a coldy for me while your waiting on the answers, in fact you can have a few if you like digger.

Thanks Kiwi and John,
It was a sad day but managed to get back in the air 6 weeks later.
Never got a shot of the carnage but it was like confetty.
Need coldies out here 39c tomorrow. Think thats about 102f. 41c there after.

Loza

[klhoard]

	Quote: Originally Posted by KrisW
	My Synthesized 72mhz JR stuff works just fine. I was very tempted to bite on the 2.4ghz technology, but I'm really glad I resisted the temptation. I had 2 pcm lockout incidents last year, both were antenna-aircraft orientation caused at long distance(DOH!!!) and quickly averted. It'll be a few years before I try 2.4ghz (If I ever do). Good thread. . GREAT information. . .nice to see an informed, intelligent, and logically applied perspective on these problems.

.
.
Kris,

Don't base your decision to go 2.4 solely on the XPS system. Both JR and Futaba 2.4G systems were designed, tested, and fielded by teams of professional engineers backed by companies with the capital, experience, and resources to do the job right.
.
.
What you are seeing now is the modelling public's unwitting participation in the XPS development story.
.
.
(Fanboys can begin ranting now. . . . )

[ben_beyer]

I lost my WH Sukhoi on it's 7th flight because of XPS. I was just doing a go-around and made a gentle turn and the system went in to lockout. It took the airplane a few seconds before it impacted the ground and I just had to sit there and watch it. I'm in graduate school so hearing this is not cool since it's lack of frequency hopping basically doomed my airplane. I sold the unit after that crash and went back to 72mhZ, but if it was so fail-proof, I'd still have the airplane.

[rede2fly]

man after reading all of this. i for 1 am glad i stuck with my 72 mhz. maby down the road after a few years of this being on the market and some of the bugs worked out, i might try it. but as of now my radio works just fine as it is. good luck to you guys that are using these expermintal systems.< (that statement being my own opion) i for 1 cant afford to throw money at the ground

[KrisW]

	Quote: Originally Posted by klhoard
	. . Kris, Don't base your decision to go 2.4 solely on the XPS system. Both JR and Futaba 2.4G systems were designed, tested, and fielded by teams of professional engineers backed by companies with the capital, experience, and resources to do the job right. . . What you are seeing now is the modelling public's unwitting participation in the XPS development story. . . (Fanboys can begin ranting now. . . . )

Okay. . give me one. . important. . logical. . all encompassing reason why I should NOT fly 72mhz. . and SHOULD fly 2.4 instead.

Just one. .

I have 14 JR 72mhz PCM receivers from 7-10 channels. . 6 of which are synthesized. 3 need realignment, I'll do that next month. Amazingly, the 7 channel 790's seem to work better than the 2000's, and certainly better than any of my crystal receivers. $90 each, and totally dependable.

Again .. ONE reason to switch.

[aviti]

	Quote: Originally Posted by KrisW
	Okay. . give me one. . important. . logical. . all encompassing reason why I should NOT fly 72mhz. . and SHOULD fly 2.4 instead. Just one. . I have 14 JR 72mhz PCM receivers from 7-10 channels. . 6 of which are synthesized. 3 need realignment, I'll do that next month. Amazingly, the 7 channel 790's seem to work better than the 2000's, and certainly better than any of my crystal receivers. $90 each, and totally dependable. Again .. ONE reason to switch.

uh...to avoid being shot down...

[exeter_acres]

	Quote: Originally Posted by aviti
	uh...to avoid being shot down...

Seems the gist of this thread seems to say lots of people are getting shot down (I believe any loss of frequency is a "shoot down")

[KrisW]

	Quote: Originally Posted by aviti
	uh...to avoid being shot down...

Is that the ONLY reason??

Even frequency hopping 2.4 can get shot down under the proper circumstances.

[aviti]

	Quote: Originally Posted by exeter_acres
	Seems the gist of this thread seems to say lots of people are getting shot down (I believe any loss of frequency is a "shoot down")

Shot down by other people turning on to your frequency. Is 2.4 new? Yes. Are there risks with new technology? Yes. Are we talking about 2.4 or XPS? Lumping these together isn't exactly fair. I've been flying on 2.4 for several months now and have been happy so far. To me it is worth it not having to worry about some moron turning on my frequency. If you don't agree, then stay with 72. But there is at least one reason to switch.

[KrisW]

	Quote: Originally Posted by aviti
	Shot down by other people turning on to your frequency. Is 2.4 new? Yes. Are there risks with new technology? Yes. Are we talking about 2.4 or XPS? Lumping these together isn't exactly fair. I've been flying on 2.4 for several months now and have been happy so far. To me it is worth it not having to worry about some moron turning on my frequency. If you don't agree, then stay with 72. But there is at least one reason to switch.

Then there's the dual receiver binding problem. I've always run dual receivers in my big stuff. . just in case.

[exeter_acres]

what "issue"